Pump construction



Jan. 19, 1954 H. J. SADLER ETAL PUMP CONSTRUCTION Filed Oct. 27. 1952INVENTORS hWIPF) d SflDLf/Q ATTORNEYS P tented Jan. 19, 1954 PUMPCONSTRUCTION Harry J. Sadler and Ernest E. Cook, Minneapolis, Minn.

' Application October 27, 1952, Serial No. 316,992

ticularly .to improvements in relatively small high-pressure 'fiuidpumps.

The primary object of our invention is the provision of novel means forautomatically disconnecting therdriving means for my novel pump from thedrive shaft and the rotary impeller carried therebywhen said impeller iscaused to bind due to frictional engagement with the housing, breakage,wear, or other conditions brought about by use. In this manner, moreextensive damage to the impeller and pump housing is prevented.

-A still further object of our invention is the I -'.l?refe'rably and asshown, an annular convenprovision of a device of the type immediatelyabove described, wherein the driving head for, the pump may be quicklyand easily operatively reconnected to the drive shaft and impeller afterthe same have been disconnected due to the unusual conditions abovedescribed.

A still further object of our invention is the provision of a device ofthe class described which is inexpensive to produce and extremelyfoolproof and durable.

The above and. still further objects of our invention will becomeapparent from the following detailed specification, appended claims andattached drawings.

Referring to the drawings, wherein like characters indicate like partsthroughout the several views:

Fig. 1 is a view in side elevation of my pump;

Fig. 2 is a view partly in end elevation, and partly in vertical axialsection taken substantially on the line 2-2 of Fig. 1; and

Fig. 3 is a view in vertical section taken on the line 3--3 of Fig. 2.

Referring with greater particularity to the drawings. the numeral Iindicates in its entirety a pump housing comprising 'a main section 2and a cover plate section 3. As shown, the section 2 has a largecircular bore 4 therein, and a laterally projecting bearing boss 5 witha reduced opening 6 therein which extends into the bore 4. Cover platesection 3 is secured to the main housing section 2 by means ofcircumferentially-spaced. headed bolts 1, and provides, with saidsection 2, a cylindrical impeller chamber 8. The cover plate section 3is provided with a laterally projecting bearing boss 9.

A drive shaft I extends eccentrically through the cylindrical chambersand has its opposite end portions journalled for rotation in the opposedbearing bosses and 9 of the housing section 2 and 3 respectively.Impeller element 3 Claims. (onus-117) H is secured to the intermediateportion of the drive shaft in for rotation therewith within the chamber8. The specific nature of the impeller element I I does not form anypart'of our present invention, but, as shown, is of the type havingrollers l2 mounted within circumferentiallyspaced radially outwardlyopening recess l3 in the periphery of the impeller ll. Roller elements12 are adapted to work radially inwardly and outwardly of the recessupon rotation of the impeller ll while engaging the. cylindrical wall 14of the chamber 8. The circumferen tiaIIy-spaced inlet and outletpassages are identifled by. thenumerals l5 and l6. 6

tionaltpressure'seal I1 is interposed between the housing section 2 andthe drive shaft ill within the bearing boss 5. Also, a conventionalballbearing race I8 is provided to reduce friction between the driveshaft l0 and the bearing boss 5 to a minimum. A similar seal and bearingrace, not; shown, are provided within the bearing boss 9. As shown, thedrive shaft I0 is tubular and has diametrically enlarged portions I9 and20 which open axially outwardly at its opposite ends. The reducedcentral portion 2! provides an annular shoulder 22, against which thehead portion 23 of a bolt 24 abuts. The opposite end of the bolt 24 isprovided with screw-threads 25. As shown, the screw-threaded end 25 ofthe bolt 24 projects axially outwardly through the recess 20, whereby toprovide an annular recess 26.

A cylindrical driving head 21 has a reduced axially extended end portion28 which is telescopically received in the annular recess 26, thethreaded portion 29 thereof receiving the threaded portion 25 of thebolt 24. It will be noted that the cooperating threaded portions 25 and29 respectively of the bolt 24 and head 21 are such that the head 21tends to unscrew itself from the bolt 24 under normal driving rotation,as indicated by the arrow in Fig. 3.

In order to operatively secure the driving head 2'! to the drive shaftII], we insert a shear-pin 30 in axially alignable openings 3| and 32 inthe adjacent end portions of the shaft l0 and head 2'! respectively.Preferably and as shown, the head 21 is provided with a plurality ofcircumferentially-spaced openings 32 which open into the bottom wall 33of an axially outwardly opening socket 34.

From the above it should be obvious that when the impeller i I, whensubjected to abnormal friction, breakage, or the like, is rotated in thedirection of the arrow on element 28 of Fig. 3,

the pin 30 will shear, whereupon continued rotation of the driving head21 will cause same to be unscrewed at least partially from the bolt 24.In this manner, any further rotation of the binding impeller H isterminated, and further damage is avoided. In the event that the bindingis merely caused by undue friction, the head 21 may be reapplied to thethreaded end 25 of the bolt 24 by first removing same therefrom,thereafter removing the sheared end portion of the shear-pin 30 from therecess 32 in the drive shaft l0, screwing the head 21 onto thescrew-threaded end 25 of the bolt 24 in a clockwise direction until therecesses 3| and '32 are in alignment, and reinserting the shear-pin 30into said aligned opening.

()ur invention has been thoroughly tested and found to be completelysatisfactory for the accomplishment of the above objects, and while wehave illustrated a commercial embodiment thereof, it should be obviousthat same is capable of modification without departure from the scope ofthe invention as defined by the appended claims.

What we claim is:

1. 'In a fluid pump, a housing comprising a main section and a coverplate section therefor, said housing defining a cylindrical chamberhaving circumferentially-spaced inlet and outlet passages, a drive shaftextending through said chamber eccentric to the axis thereof and havinits opposite ends journalled for rotation in said housing sections, animpeller element on said shaft within said chamber, said drive shafthaving an axial opening therethrough, a headed bolt extending throughsaid opening, said bolt having a head at one end and terminating at itsopposite end in screw-threads, said opening through said drive shafthaving a diametrically enlarged portion providing an annular axiallyextended opening about said screw-threaded end, a rotary driving headhaving a diametrically reduced end portion telescopically receivable insaid annular recess and having a central screwthreaded opening for thereception of the threaded end of said bolt, the direction of the threadson said bolt and driving head being such that said head tends to unscrewitself from said bolt under normal driving rotation, and a shearpinrotated by said driving head and shaft and connecting same for commonrotary movements,

2. The structure defined in claim 1 in which said driving head, and theadjacent end of said drive shaft, is provided with axially extendedalignable openings for the reception of said shearpm. i

3.. The structure defined in claim 1 in which said driving head definesa socket concentric with the axis of said drive shaft, the bottom ofsaid socket and the adjacent end of said drive shaft having axiallyextended alignable recesses for the reception of said shear-pin.

HARRY J. SADLER. ERNEST E. COOK.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,865,438 Friedemann July 5, 1932 .-2, 4 ','7'9'7 .Bochmann eta1. Aug. .4, 1936 2,541,405 Chapman Feb. 13, 1951

